Abstract
Cyanide Containing Wastewater Treatment by Ozone Enhanced Catalytic Oxidation over Diatomite Catalysts
Highlights
Cyanidation is the most popular process by which gold is recovered from the ores in mining operations
The increase in apparent rate constant Kapp resulted from adding diatomite during the ozone process can be used to indicate the contribution and contribution percentage of effect of diatomite catalyst, which was calculated as the following equation: Contribution Kapp = Kapp(with diatomite) - Kapp(without diatomite)
During cyanide oxidation by catalytic oxidation with ozone, the contribution and contribution percentage of diatomite which was used as catalyst were investigated by comparison with single ozone process
Summary
Cyanidation is the most popular process by which gold is recovered from the ores in mining operations. The aqueous cyanide solution which is used to dissolution of gold is typically carried out with 0.03-0.3% NaCN [1]. The cyanide in the solution is used as complexing agent. For the widespread use of cyanide in gold mining operation, the purification of cyanide is important. Both treatment efficiency and cost could be considered [3]. The Ministry of Environmental Protection of the People’s Republic of China has proposed a discharge limit of 0.5 mg/L cyanide for sewers. For meeting the strict discharge standard requirement, several cyanide treatment processes have been developed
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